These valve springs are made with premium Super Clean Chrome silicon Vanadium Steel alloy for the highest performance and durability at high rpm's. They are computer designed to ensure that wire stress levels do not surpass the limits of stress defined in the diagrams of fatigue for long durability under extreme conditions.
Toyota 2TC 3TC Valve Spring Set Install High 1.600. These Springs are properly designed to control the dominant harmonics, while providing needed stability to reduce valve train component wear.